The only way to outfool a fool is to fool him.
4 seconds sound clip from The New Adventures of Winnie the Pooh - Pooh Skies / April Pooh (S3E5).
You can hear this line at 00:18:36.065 in the Blu-ray version of the TV Series.
Quote context
[...]
- But if the April Fool is invisibibble, how shall we find him to ask him if he's scary or not?
- By being invisibibble ourselves.
- Have we found the April Fool yet?
- The only fool around here has stripes.
- I can't believe Tigger talked me into this.
- The only way to outfool a fool is to fool him.
- Eeyore!
- Hawmp!
- And then we won't be able to fool him anymore.
- I guess I'd better do what they say. Wouldn't want to get turned into a stump like my friends.
- We're not really stumps. We just have to pretend to be until we capture the invisible April Fool.
- Of course. Just what I thought. When I pretend to be a stump, that's usually the reason.
[...]